CVE-2026-81509
nforwardauth is a forward auth service that allows the use of a single authentication middleware…
- Risk score
- 42/100
- CVSS
- 6.1 v3.1
- Exploit chance (30 days)
- 0.3%
- Published
- 26 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- nforwardauth is a forward auth service that allows the use of a single authentication middleware for multiple sites. Versions prior to 1.5.1 accept an unvalidated r query parameter on the /login endpoint and use them as the post-authentication redirect destination. An unauthenticated attacker can create a legitimate n…
- Affected
- See advisory
- Fix
- Upgrade the product to 1.5.1 or later.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 6.1 medium
References
Original description
nforwardauth is a forward auth service that allows the use of a single authentication middleware for multiple sites. Versions prior to 1.5.1 accept an unvalidated `r` query parameter on the `/login` endpoint and use them as the post-authentication redirect destination. An unauthenticated attacker can create a legitimate `nforwardauth` login URL that redirects a victim to an attacker-controlled website after the victim successfully authenticates. This issue may facilitate phishing and other social-engineering attacks by abusing the trust associated with the legitimate authentication domain. This vulnerability does not provide an unauthenticated ForwardAuth bypass. Version 1.5.1 contains a patch.
Last activity 26 Oct 2026. Patch Forecast updates every hour.